[Wishbone]

How hard is it to swap pistons in a bike engine?

No problems with my mota just wanna swap pistons to some high compression dealies since they are cheap and my bike gets the best HP numbers on 87 octane I could swap them on the cheap for a good bump in HP


I have never tore into am engine myself but ever new task I shoot for (mecanicly speeking) I do a good job at. Hell 6 years ago I didn't even know how an internal combustion engine even worked and now I could carry on a conversation about engines with most gear heads with out a problem. I love to learn and am not afraid to screw with my bike.

So is it easy enough to do my self or should I send it to a shop?

My other option with my engine is to shave the head and run a thinner head gasket, but if I do that I would have to use slotted cam gears to get the correct timing. That would bump me from 11.4:1 to about 13:1
The pistons would give me 13:1

So is it easier to pull the head (keep the engine in the frame) and work it then put it back in

Or pull the engine tear into the bottom end and swap pistons?

[The Crashing Tomato]

Hey Jon, seeing as how I'm the first D-B to chime in on this, I'll be nice for a change.










If it ain't broke don't fuck with it




You'd be sooooo much better served by changing sprockets ......the front down 1 tooth ( 15 to 14 ) and rear ( maybe up 1 or 2 teeth (44 to 45 or 46).... depends where the FZ makes good power) .



Or you could put a turbo on it and never have to crack the engine open

[DucDave]

I'm pretty sure it's my pistons that are keeping my lap times slower than I'd like...

[The Crashing Tomato]

puaaahhahahahaha!

TURBO FZ

[Wishbone]

Originally Posted by DucDave

I'm pretty sure it's my pistons that are keeping my lap times slower than I'd like...

nice!!!

Yeah I hear ya Matty but what the hell its fun do do stuff to the bike. Not that I need to, but what else constructive stuff is there to do in the winter? I like pond hockey but with all this snow its a PITA to keep shoveling the ponds

O and I'm at 14&46 now and think I'm gonna go to a 48

and whats with your avatar title? Its way long and look weird, I view in V2.0 and have the names/avatar/info on the right

[The Crashing Tomato]

PAINT IT fix the seat do as many SUSPENSION mods as you can afford

[Wishbone]

on the list, on the list, already GMDEDEDED the front and a Penske is in order

[The Crashing Tomato]

I know I can be a real whack job sometimes but if ya need any help wrenchin I have a heated garage with lots O tools, air and otherwise

[Wishbone]

Thanks for the offer, but I keep my bike in my wife's cousin's garage in Woosta

Feel free to drop me a line if ya wanna come by and kick the bike

[The Crashing Tomato]

Ok with that said .... have you checked the FZ forums to find out if its possible without major head modifications

IF the FZ has a (horizontally) split cylinder bank from the lower cases you should be able to.... do it without crackin the lower end. You'd just take the eng out of the frame to give yourself enough room to work. remove the cylinder bank remove the wrist pin clips and drive the pin out ... put new piston on drive pin in and re clip finish re assembly ..stuff it back in it's home, change the jets, power up the Dyno and .... vua la / viola

For shit sake use 93 ya cheap bastid

[Wishbone]

Yeah i checked them CLICKY and got a few good responses.

I think I'm gonna go with shaving the head, seems easier and I'm a donkey so it might be more gooderer for me to take that route.

As for the octane. I used to use 93 ALL the time, last winter I put in a Holeshot Performance Products, Inc. stage II jet kind and it says in big bold letters USE 87 OCTANE since they dynoed several bikes with that kit on all different grades of gas and got the best numbers with 87. So if you use a higher octane than needed its like pissing up a rope, and thats why I want to bump my compression

[The Crashing Tomato]

SU - eeet